Understanding and mitigating decoherence in fluxonium qubits – Energy relaxation
ORAL
Abstract
Fluxonium qubits with long coherence times and large anharmonicities are one of the promising alternatives to transmons for achieving higher-fidelity gates. While the coherence time of fluxonium qubits has improved greatly in the past few years to the hundreds of microseconds level, theoretical and numerical evidence indicates that even longer coherence times can be achieved. Here, we experimentally study the energy relaxation of 2D fluxonium qubits to understand and then mitigate decoherence sources. Using a high-bandwidth flux control, we measure the relaxation time over a wide range of flux biases, mapping out the noise spectrum over a wide frequency range. We find that spurious tunneling two-level systems and excess quasiparticles are the dominant sources of energy relaxation. By improving the device fabrication process and the shielding against stray high-energy radiation, we achieve relaxation times on the order of hundreds of microseconds for 2D qubits in the light-fluxonium regime. We will also discuss other decoherence mitigation techniques for fluxonium qubits.
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Presenters
Hantao Sun
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Authors
Hantao Sun
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Feng Wu
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Hsiang-Sheng Ku
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Hao Deng
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Princeton University
Dawei Ding
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Ran Gao
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Xun Gao
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Group, Alibaba Quantum Laboratory
Xun Jiang
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Zhisheng Li
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Xiaotong Ni
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Group, Alibaba Quantum Laboratory
Jin Qin
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Zhijun Song
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Chengchun Tang
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Tenghui Wang
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Wenlong Yu
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Tian Xia
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Gengyan Zhang
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Xiaohang Zhang
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Jingwei Zhou
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Xing Zhu
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Additional Contributing AQL Members
Alibaba Quantum Laboratory, Alibaba Group
Yaoyun Shi
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Jianxin Chen
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Hui-Hai Zhao
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory, Alibaba Group
Alibaba Quantum Laboratory
Alibaba Group, Alibaba Quantum Laboratory
Chunqing Deng
Alibaba Quantum Laboratory Experimental Team, Alibaba Quantum Laboratory, Alibaba Group
